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Pinpoint Test P: The Air Conditioning (A/C) Is Always On

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Diagnose any PCM, HVAC module or ACCM  DTCs before carrying out the following pinpoint test.
  1. P1 CHECK THE A/C EVAPORATOR TEMPERATURE (EVAP_TEMP) HVAC PID 
    • Allow the vehicle exterior and interior to stabilize to an ambient temperature.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: EVAP_TEMP HVAC PID.
    • Does the EVAP_TEMP HVAC PID read similar to the ambient temperature? 
    • Yes:  GO to P2  .
    • No:  INSTALL a new A/C evaporator discharge temperature sensor. TEST the system for normal operation.
  2. P2 CHECK THE (A/C) SWITCH (CC_SW_AC) HVAC PID WITH THE A/C OFF 
    • Start the engine.
    • Enter the following diagnostic mode on the scan tool: CC_SW_AC HVAC PID.
    • Select PANEL and make sure the A/C indicator is OFF.
    • Does the CC_SW_AC HVAC PID read Inactive? 
  3. P3 CHECK THE AIR CONDITIONING COMPRESSOR COMMANDED STATE (ACC_CMD) PCM PID WITH THE A/C OFF 
    • Enter the following diagnostic mode on the scan tool: ACC_CMD PCM PID.
    • Select PANEL and make sure the A/C indicator is OFF.
    • Does the ACC_CMD PCM PID read OFF? 
    • Yes:  INSTALL a new electric A/C compressor. REFER to REMOVAL AND INSTALLATION . TEST the system for normal operation.
    • No:  INSTALL a new PCM. TEST the system for normal operation.
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